I thought it was a bit of a trend these days, so I tried to do it, but I shoveled a lot in the beginning, so I'll share how to use it in the hopes that those who read this won't get lost.
First, open Instagram, press the + button, and select Reel.
On the next screen, press the Effect button.
Search with the word before in the search item. And select Before/After SScan.
The important thing here is adding media. It didn't automatically find similarities, it was just to create content by selecting photos. At first, I was fooled too. If I don't select it, only a mosaic grid will appear.
And just choose one picture you want.
Finally, start shooting.
Hope this helps!